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TypeTelepen.php
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<?php
/**
* Adapted by Darren Stephens <[email protected]>
* from Java implementation of Telepen by <[email protected]> Robin Stuart
* at https://github.com/woo-j/OkapiBarcode which uses the
* Apache License 2.0 http://www.apache.org/licenses/LICENSE-2.0
*
* Implements Telepen (also known as Telepen Alpha), and Telepen Numeric.
*
* Telepen can encode ASCII text input and includes a modulo-127 check digit.
* Telepen Numeric allows compression of numeric data into a Telepen symbol. Data
* can consist of pairs of numbers or pairs consisting of a numerical digit followed
* by an X character. Telepen Numeric also includes a mod-127 check digit.
*/
namespace Picqer\Barcode\Types;
use Picqer\Barcode\Barcode;
use Picqer\Barcode\BarcodeBar;
use Picqer\Barcode\Exceptions\InvalidFormatException;
class TypeTelepen implements TypeInterface
{
private const TELEPEN_START_CHAR = '_';
private const TELEPEN_STOP_CHAR = 'z';
private const TELEPEN_ALPHA = 'alpha';
private const TELEPEN_NUMERIC = 'numeric';
private array $telepen_lookup_table;
private string $mode;
public function __construct($m = 'alpha')
{
$this->mode = self::TELEPEN_ALPHA;
if (strtolower($m) == 'numeric') {
$this->mode = self::TELEPEN_NUMERIC;
}
$this->createTelepenConversionTable();
}
public function getBarcode(string $code): Barcode
{
/* The stream we get from the telepen output gives us the
* width of alternating black/white stripes
*/
$encoded = $this->encode($code); //binary string
$barcode = new Barcode($code);
$drawBar = true;
for ($i = 0; $i < strlen($encoded); ++$i) {
$barWidth = $encoded[$i];
$barcode->addBar(new BarcodeBar(intval($barWidth), 250, $drawBar));
$drawBar = !$drawBar; //flip to other colour
}
return $barcode;
}
protected function encode($code) : string
{
if ($this->mode == self::TELEPEN_ALPHA) {
$result = $this->encodeAlpha($code);
} else {
$result = $this->encodeNumeric($code);
}
return $result;
}
protected function encodeAlpha($code) : string
{
// We aren't interested in the non-printable parts of the ASCII set
if (
!preg_match('/[ -~]+/', $code)
) { // everything from ASCII32-ASCII127
throw new InvalidFormatException("Invalid characters in data");
}
$count = 0;
/* other implementations use the byte-chr-int type equivalence to work
* with array indices in the conversion/lookup table. It's probably
* better to be more explicit with php, hence the use of ord and chr here.
*/
// begin with start char
$dest = $this->telepen_lookup_table[ord(self::TELEPEN_START_CHAR)];
for ($i = 0; $i < strlen($code); $i++) {
//$ascii_code = ord(substr($code, $i, 1));
$ascii_code = ord($code[$i]);
$dest .= ($this->telepen_lookup_table[$ascii_code]);
$count += $ascii_code;
}
// Now add check and terminator
$check_digit = 127 - ($count % 127);
if ($check_digit == 127) {
$check_digit = 0;
}
$dest .= $this->telepen_lookup_table[ord(strval($check_digit))];
$dest .= $this->telepen_lookup_table[ord(self::TELEPEN_STOP_CHAR)]; // Stop
return $dest;
}
private function encodeNumeric(string $code) : string
{
/* If input contains non-numeric or X, exit */
if (!preg_match('/^[0-9X]+$/', $code)) {
throw new InvalidFormatException("Invalid characters in data");
}
/* If input is an odd length, exit */
$t = '';
if (strlen($code) % 2 > 0) {
throw new InvalidFormatException("There must be an even number of digits");
}
$count = 0;
$dest = $this->telepen_lookup_table[ord(self::TELEPEN_START_CHAR)]; // begin with the start character _
for ($i = 0; $i < strlen($code); $i += 2) {
$c1 = $code[$i];
$c2 = $code[$i+1];
/* Input nX is allowed, but Xn is not */
if ($c1 == 'X') {
throw new InvalidFormatException("Invalid position of X in data");
}
$glyph = null;
if ($c2 == 'X') {
$glyph = (ord($c1) - ord('0')) + 17;
} else {
$glyph = ((10 * (ord($c1) - ord('0'))) + (ord($c2) - ord('0'))) + 27;
}
$count += $glyph;
$dest .= $this->telepen_lookup_table[$glyph];
}
$check_digit = 127 - ($count % 127);
if ($check_digit == 127) {
$check_digit = 0;
}
$dest .= $this->telepen_lookup_table[$check_digit];
$dest .= $this->telepen_lookup_table[ord(self::TELEPEN_STOP_CHAR)]; // Stop
return $dest;
}
/**
* The table provides a representation of barcode patterns
* for each character in the ASCII set. from ASCII0-127
* Each barcode starts with "_" - ASCII95 0x5F,
* and ends with "z" - ASCII122 0xFA.
* More information about Telepen symbology is available from
* https://v4l237.n3cdn1.secureserver.net/wp-content/uploads/2022/05/Barcode-Symbology-information-and-History.pdf
*/
private function createTelepenConversionTable(): void
{
$this->telepen_lookup_table = [
"1111111111111111", "1131313111", "33313111", "1111313131",
"3111313111", "11333131", "13133131", "111111313111",
"31333111", "1131113131", "33113131", "1111333111",
"3111113131", "1113133111", "1311133111", "111111113131",
"3131113111", "11313331", "333331", "111131113111",
"31113331", "1133113111", "1313113111", "1111113331",
"31131331", "113111113111", "3311113111", "1111131331",
"311111113111", "1113111331", "1311111331", "11111111113111",
"31313311", "1131311131", "33311131", "1111313311",
"3111311131", "11333311", "13133311", "111111311131",
"31331131", "1131113311", "33113311", "1111331131",
"3111113311", "1113131131", "1311131131", "111111113311",
"3131111131", "1131131311", "33131311", "111131111131",
"3111131311", "1133111131", "1313111131", "111111131311",
"3113111311", "113111111131", "3311111131", "111113111311",
"311111111131", "111311111311", "131111111311", "11111111111131",
"3131311111", "11313133", "333133", "111131311111",
"31113133", "1133311111", "1313311111", "1111113133",
"313333", "113111311111", "3311311111", "11113333",
"311111311111", "11131333", "13111333", "11111111311111",
"31311133", "1131331111", "33331111", "1111311133",
"3111331111", "11331133", "13131133", "111111331111",
"3113131111", "1131111133", "33111133", "111113131111",
"3111111133", "111311131111", "131111131111", "111111111133",
"31311313", "113131111111", "3331111111", "1111311313",
"311131111111", "11331313", "13131313", "11111131111111",
"3133111111", "1131111313", "33111313", "111133111111",
"3111111313", "111313111111", "131113111111", "111111111313",
"313111111111", "1131131113", "33131113", "11113111111111",
"3111131113", "113311111111", "131311111111", "111111131113",
"3113111113", "11311111111111", "331111111111", "111113111113",
"31111111111111", "111311111113", "131111111113"
];
}
}